TW201119125A - RFID tag antenna having double-open ends coupler structure - Google Patents

RFID tag antenna having double-open ends coupler structure Download PDF

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Publication number
TW201119125A
TW201119125A TW098138796A TW98138796A TW201119125A TW 201119125 A TW201119125 A TW 201119125A TW 098138796 A TW098138796 A TW 098138796A TW 98138796 A TW98138796 A TW 98138796A TW 201119125 A TW201119125 A TW 201119125A
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TW
Taiwan
Prior art keywords
antenna
coupler
rfid tag
double
tag antenna
Prior art date
Application number
TW098138796A
Other languages
Chinese (zh)
Inventor
Chih-Chen Chang
Original Assignee
Claridy Solutions Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Claridy Solutions Inc filed Critical Claridy Solutions Inc
Priority to TW098138796A priority Critical patent/TW201119125A/en
Priority to EP09177531.2A priority patent/EP2323075B1/en
Priority to US12/627,070 priority patent/US20110115685A1/en
Publication of TW201119125A publication Critical patent/TW201119125A/en

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
    • G06K19/07773—Antenna details
    • G06K19/07786—Antenna details the antenna being of the HF type, such as a dipole
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H01Q1/2225—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/26—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength
    • H01Q9/265—Open ring dipoles; Circular dipoles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/28—Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines
    • H01Q9/285—Planar dipole
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49016—Antenna or wave energy "plumbing" making

Abstract

The present disclosure relates to a RFID tag, more particularly to, a UHF band RFID tag antenna having a double-open ends coupler; wherein the structure thereof is using a half wavelength dipole antenna with a double-open ends coupler mutually coupled to each other, and the RFID chip is disposed upon the coupler, and the coupler is designed to be double-open ends structure so as to, rather than prior arts, enhance the radiation without compromising the impedance match between the antenna and the chip.

Description

201119125 六、發明說明·· 【發明所屬之技術領域】 天線，尤其是有關於一 頻辨識標籤天線。 本發明係為一種射類辨識標鐵 種具有雙端開路耦合結構的寬頻射 【先前技術】 ’可通過無線電訊號識 而無需識別系統與特定目標 热線射頻識別是一種通信技術， 別特定目標並讀寫相關數據， _ 《間建立機械或光學接觸。隨著無㈣頻識別技術的普 及，弄多手持式電子裴置均内建有無線射頻識別天線。 無線射頻識別天線依工作頻率可分為低頻天線、高頻 (high frequency，HF)天線、超向頻（uitrahigh frequency, UHF)天線以及微皮（microwave)天線。低頻天線的工作頻率 是125 KHz至134KHz，高頻天線的工作頻率是13. 56 MHz， 超高頻天線的工作頻率是介於868 MHz至955 MHz之間， • 而微波天線的工作頻率是2. 45GHz至5.8GHz。一般而言， 0 内建於手持式電子裝置中的無線射頻識別天線為超高頻天 線而超高頻無線射頻識別天線是藉由輻射（radiati〇n)的 方式進行傳輸。 美國公告號7545928案揭示一種射頻辨識標籤1〇及其 阻抗匹配方法，如圖一，其具有一天線本體1 〇 1及一麵合 迴圈102其置於一基板103上並具有兩饋入點i〇2a/i〇2b。 該耦合迴圈102因阻抗匹配的緣故，其本身是一個小型電 感’幾乎不具有輻射功能，也就是說，為顧及天線與晶片 之間的阻抗匹配，需使用幾無輻射功能的小型輕合迴圈 201119125 102(該小型耦合迴圈1〇2通常小於天線本體ι〇1的3〇%)使 天線的輸入阻抗帶有足夠的感抗（in(juctive reactance)，以消 除晶片所帶有的容抗(capacitive reactance)，從而達成共軛 匹配，知果達成匹配其輸入埠（inputp〇n)反射損失（return loss)將如圖一 a所示，其阻抗特性如圖二所示（其中天線之 輸入阻杬的實部以Ra表示，虛部以表示；晶片之輸入 阻抗的貫部以表示，虛部以Xc表示）。 緣此，本案之發明人係研究出一種新的射頻辨識標籤 天線’尤其是有關於-種具有雙關物合結構的射頻辨 識標籤天線，係可達成與先前技藝相同（或較佳）頻寬表現。 【發明内容】 η俨籤的/目的2於提供一種新的UHF頻段之射頻势 識軚戴天線，係可增加頻寬並提升輻射效& 天線本=::7種雙瑞開路辑合結構:射頻辨識㈣ 一天線本體（anntena bod ) ^^-^MCresonance)^^ ' 天線本體所接收之射頻信_合至 ^可该 器係為雙端開路的線型結構，1 + 可被視為-個具有輕射效能的偶極^略為Μ波長’布 法 IT1 τ::驟種應用於1«辨識標籤的設計^ 1. 該天線的中心工作頻率 ^ 長度而決定。由調整天線本體的 2. 該天線的實部阻，可藉由調整天線本體與搞合 201119125 态之間的距離，使其與晶片之實部阻抗達成匹 配。 3.該天線的虛部阻抗可藉由調整耦合器的長度，使 其與晶>1之虛部阻抗達成共輊匹配。 為使貴審查委員對於本發明之結構目的和功效有更 進一步之了解與認同，茲配合圖示範例詳細說明如後。 【實施方式】201119125 VI. INSTRUCTIONS··· TECHNICAL FIELD OF THE INVENTION The antenna, in particular, relates to a frequency identification tag antenna. The invention relates to a wide-spray radiation type with a double-ended open-circuit coupling structure. [Previous technology] can be identified by radio signals without identifying the system and a specific target hotline. Radio frequency identification is a communication technology, and specific targets are Read and write related data, _ "Build mechanical or optical contact. With the adoption of the (four) frequency identification technology, many handheld electronic devices have built-in radio frequency identification antennas. The radio frequency identification antenna can be classified into a low frequency antenna, a high frequency (HF) antenna, a uitrahigh frequency (UHF) antenna, and a microwave antenna according to the operating frequency. The operating frequency of the low frequency antenna is 125 KHz to 134 KHz, the operating frequency of the high frequency antenna is 13.56 MHz, the operating frequency of the UHF antenna is between 868 MHz and 955 MHz, and the operating frequency of the microwave antenna is 2 45GHz to 5.8GHz. In general, 0 radio frequency identification antennas built into handheld electronic devices are UHF antennas and UHF radio frequency identification antennas are transmitted by means of radiation. U.S. Patent No. 7,545,928 discloses an RFID tag 1 〇 and its impedance matching method. As shown in FIG. 1 , an antenna body 1 〇 1 and a combined loop 102 are placed on a substrate 103 and have two feed points. I〇2a/i〇2b. Due to the impedance matching, the coupling loop 102 itself is a small inductor 'having almost no radiation function, that is, in order to take into account the impedance matching between the antenna and the wafer, it is necessary to use a small light-return function with few radiation functions. Circle 201119125 102 (this small coupling loop 1〇2 is usually less than 3〇% of the antenna body ι〇1) so that the input impedance of the antenna has sufficient inductive reactance (in (juctive reactance) to eliminate the capacitance of the wafer Capacitive reactance, so as to achieve conjugate matching, the result of matching the input 埠 (inputp〇n) reflection loss will be as shown in Figure a, and its impedance characteristics are shown in Figure 2 (where the antenna The real part of the input resistance is represented by Ra, the imaginary part is represented; the intersection of the input impedance of the chip is indicated, and the imaginary part is represented by Xc.) Therefore, the inventor of the present invention developed a new RFID tag antenna. In particular, there is a radio frequency identification tag antenna having a double-closed structure, which can achieve the same (or better) bandwidth performance as the prior art. [Abstract] η俨签/目2 provides a new The RF potential of the UHF band is used to increase the bandwidth and improve the radiation efficiency. Antennas =:: 7 kinds of Shuangrui open-circuit combination structure: Radio frequency identification (4) One antenna body (anntena bod) ^^-^ MCresonance)^^ ' The RF signal received by the antenna body is combined with a linear structure with a double-ended open circuit. 1 + can be regarded as a dipole with light-light performance. IT1 τ:: The type of design applied to the 1« identification tag ^ 1. The center of the antenna is determined by the length of the antenna. By adjusting the real resistance of the antenna body, the distance between the antenna body and the state of the 201119125 can be adjusted to match the real impedance of the chip. 3. The imaginary impedance of the antenna can be matched to the imaginary impedance of the crystal by adjusting the length of the coupler. In order to enable the reviewing committee to have a better understanding and recognition of the structural purpose and efficacy of the present invention, the following examples are described in detail with reference to the illustrated examples. [Embodiment]

有關本發明為達成上述目的，所採用之技術、手段及 其他之功效，茲舉一較佳可行實施例並配合圖式詳細說明 如后，相k本發明上述之目的、特徵及其他之優點，當可 由之得一深入而具體之瞭解，惟本發明並非惟一之實施 例，容此說明之。 圖三為本發明之—較佳實施例，其亦具有—天線本體 301及-雙端開路搞合器3〇2纟可被置於一基板挪上。 天線本體301及雙蠕開路搞合器逝可以是一個偶極 (dipoleR線’但不限於偶極天線，此雙端開路麵合器聊 ί你/」錢天線’其輪入埠3G2a/3G2b(i— P〇rt)乃是 * 3〇2上，通常在輕合器302開路兩端的中央， 但也不限於中央。 二頻辨識標籤，其進-步包含- 上之輸人埠之-極二晶片3〇4經由該耦合器3〇2 輸入一射頻信號。 U及輪入蜂之另一極302b接收或 此時耦合器302可执斗& 繞天線本體的外緣，也^十為圍繞天線本體3G1，可以圍 可以圍繞天線本體的内緣，如圖三 201119125 a所示。該天線可以工作在丽頻段及微波頻段。 兹藉圖三進一步說明，為使天線的輸入阻抗達成電感 ㈣编合器302的總長度通常約略大於1/2波長。反之， 為使天線的輸人阻抗麵電容性時，耗合H 302之總長戶 通系、勺略〗、於1/2波長。相對於先前技藝的阻抗匹配網整 ^法，本發賴制的枝，在達成阻抗匹配的同時 藉由搞合器3G2本身_射效能，進而提高天線整體的幸s 射效能。▲該天線輸入阻抗之電抗值（reactance)隨著輛合^ 長度的變化而有所改變，其關係如圖四所*。 11 、兹藉圖五再進一步說明，為使天線所需阻抗的實部可 達到所需電阻值（resistance)，耦合器3〇2與天線本體 之間的距離d越近’電阻值也就越小；距離d越遠，電阻 值也就越大以達到所需阻抗的實部，其關係如圖五所示 而本案相異於既有技藝者，乃是採用雙端開路耦^考 302取代耦合迴圈1〇2,而雙端開路耦合器3〇2本身就是二 個偶極天線，其輻射效果強於所述之小型耦合迴圈, 因此本發明所要求保護之具有雙端開路耦合結構之射頻辨 識標籤天線，其輻射效果及頻寬表現將不亞於甚而優於前 圖六本發明之反射損失(return loss)的信號圖，本發明 可在阻抗匹配的情況下，達到以中心工作頻率為準的 的頻寬。 ° 圖四〜圖六的工作頻率在此以超高頻為例說明’但亦可 藉調整第一天線本體的長度以應用於微波電路使本體工作 頻率是2· 45GHz至5. 8GHz。其耦合器尺寸亦可隨之變化在 此不再贅述。 201119125 本發明的另一種實施方式，如圖六&所示，其中天線 本體^與ίι合器6G2之間的平行距離可以保持固定，然 _ σ胃602的兩端與天線本體6〇3的兩端，其距離⑷ -是可以改變的’改變此距離的效果與前述圖三所示之實施 例改變天線本體301與轉合器3〇2之間的平行距離效果相 同。 一本發明亦可採用雙天線本體的方式實施之，如圖六b 所=’其中雙天線本體6〇5，_與搞合器6〇4之間的平行 距_可以保持固疋，然而叙合器⑼4的四個端點與雙天線 本體605/606的四個端點，其距離⑷是可以改變的。改變 此距離的效果與前述圖三及圖六所示之實施例之效果相 同，其中雙天線本體605/606的長度可以不必完全相等， 此舉可以ie成雙重耦合，進而增加工作頻寬。上述具有雙 端開路耦合器302之RFID標籤天線，也可以採用具有背面 接地基板（ground plane)之微帶天線（micro_strip antenna)的型式實施之；同理，上述具有雙端開路耦合器 • 302之RFID標籤天線，也可以採用具有背面接地基板 • 7〇4(ground plane)之貼片天線 7〇3(patch antenna)的型 式貫施之，如以貼片天線703的型式實施之，則天線本體 703可以是一個貼片天線，而其耦合器7〇2可以是一個包 含晶片701之雙端開路的微帶天線，如圖七所示。 圖三、圖三a、以及圖六a/b中所示之，，L，，係指耦合器 兩端其長度可以被調整以達到與耦合器上的晶片虛部阻抗 匹配的參數，热悉本項技藝者可自行變化而不背離本發明 之範圍。 本發明亦係關於一種應用於一射頻辨識標籤的設計方 201119125 法，包含以下三步驟· 1. 提供一夭線本體及一雙端開路的耦合器以構成 一天線；其中該天線的中心工作頻率係由該天線 本體的長度所決定。 2. 該天線的實部阻抗係藉由調整天線本體與耦合 器之間的距離，使其與一晶片之實部阻抗達成匹 酉己。 3. 該天線的虛部阻抗係藉由調整耦合器雙端開路 的長度，使其與該晶片之虛部阻抗達成匹配。 唯以上所述者，僅為本發明之範例實施態樣爾，當不 能以之限定本發明所實施之範圍。即大凡依本發明申請專 利範圍所作之均等變化與修飾，皆應仍屬於本發明專利涵 蓋之範圍内，謹請貴審查委員明鑑，並祈惠准，是所至 201119125 【圖式簡單說明】 圖一係為先前技藝射頻辨識標籤之示意圖； 圖一 a係為先前技藝射頻辨識標籤天線之工作頻寬示 意圖； 圖二係為先前技藝射頻辨識標籤天線與晶片之阻抗匹 配示意圖； 圖三係為用於本發明射頻辨識標籤一較佳實施例示意 圖， 圖三a係為用於本發明射頻辨識標籤另一較佳實施例 不意圖， 圖四為本發明之虛部阻抗圖， 圖五為本發明之實部阻抗圖； 圖六為本發明之本發明之反射損失(return loss)的信號 圖， 圖六a係為用於本發明射頻辨識標籤另一較佳實施例 不意圖， 圖六b係為用於本發明射頻辨識標籤另一較佳實施例 示意圖；以及 圖七為本發明以貼片天線（patch antenna)之型式實施 之範例。 【主要元件符號說明】 10 射頻辨識標籤 101 天線本體 102 耦合迴圈 103 基板 201119125 301 天線本體 302 雙端開路耦合器 303 基板 304 射頻辨識晶片 602 _合器 603 天線本體 604 搞合器 605/606 雙天線本體 701 晶片 702 耦合器 703 天線本體 704 接地基板 10The above described objects, features, and other advantages of the present invention are set forth in the description of the preferred embodiments. It is to be understood that the invention is not limited to the specific embodiment. Figure 3 is a preferred embodiment of the present invention, which also has an antenna body 301 and a double-ended open-circuit combiner 3〇2纟 that can be placed on a substrate. The antenna body 301 and the double-creep open circuit can be a dipole (dipoleR line 'but not limited to a dipole antenna, this double-ended open road bridge chats with you / "money antenna" its wheel 埠 3G2a / 3G2b ( i—P〇rt) is *3〇2, usually at the center of both ends of the opener of the light combiner 302, but not limited to the center. The second frequency identification tag, its advance step contains - the input of the person - the pole The two chips 3〇4 input a radio frequency signal via the coupler 3〇2. U and the other pole 302b of the wheeled bee receive or at this time the coupler 302 can fight & around the outer edge of the antenna body, also Surrounding the antenna body 3G1, it can surround the inner edge of the antenna body, as shown in Fig. 3, 201119125 a. The antenna can work in the LSI band and the microwave band. Further explanation is given by Fig. 3 to achieve inductance for the input impedance of the antenna (4) The total length of the combiner 302 is usually about a little more than 1/2 wavelength. Conversely, in order to make the input impedance plane of the antenna capacitive, the total length of the H 302 is limited to 1/2 wavelength. In the prior art, the impedance matching network method, the branch of the present system, achieves impedance matching. At the same time, by the 3G2 itself, the efficiency of the antenna is improved, and the overall performance of the antenna is improved. ▲ The reactance of the input impedance of the antenna changes with the length of the vehicle, and the relationship is as shown in the figure. Four *. 11, further illustrated by Figure 5, in order to achieve the required resistance of the real part of the required impedance of the antenna, the closer the distance d between the coupler 3〇2 and the antenna body is 'resistance The smaller the value, the farther the distance d is, the larger the resistance value is to reach the real part of the required impedance. The relationship is shown in Figure 5. The case is different from the existing artisans, but the double-ended open-circuit coupling is used. ^ test 302 replaces the coupling loop 1〇2, and the double-ended open-circuit coupler 3〇2 itself is two dipole antennas, the radiation effect is stronger than the small coupling loop described, so the claimed invention has double The radio frequency identification tag antenna with open-ended coupling structure has the same radiation effect and bandwidth performance as the signal diagram of the return loss of the present invention. The present invention can be used in the case of impedance matching. Achieve the central operating frequency The bandwidth of Figure 4 to Figure 6 is illustrated here by UHF as an example. However, the length of the first antenna body can also be adjusted to apply to the microwave circuit so that the operating frequency of the body is 2·45 GHz to 5. 8 GHz. The size of the coupler can also be changed accordingly. No further details will be described herein. 201119125 Another embodiment of the present invention, as shown in FIG. 6 & shown, wherein the parallel distance between the antenna body and the glider 6G2 can be maintained. Fixed, _ σ 胃 stomach 602 and the ends of the antenna body 6 〇 3, the distance (4) - can be changed 'the effect of changing this distance and the embodiment shown in Figure 3 to change the antenna body 301 and turn The parallel distance between the 3〇2 effects is the same. One invention can also be implemented by means of a dual antenna body, as shown in Fig. 6b = 'where the parallel distance between the double antenna body 6〇5, _ and the fitter 6〇4 can remain solid, however The four end points of the combiner (9) 4 and the four end points of the dual antenna body 605/606, the distance (4) of which can be changed. The effect of changing this distance is the same as that of the embodiment shown in Figures 3 and 6 above, wherein the lengths of the dual antenna bodies 605/606 may not necessarily be equal, which may be double coupled, thereby increasing the working bandwidth. The RFID tag antenna having the double-ended open circuit coupler 302 can also be implemented by a micro-strip antenna having a ground plane; similarly, the above-mentioned double-ended open circuit coupler • 302 The RFID tag antenna can also be applied in the form of a patch antenna having a back grounded substrate and a ground plane, such as a patch antenna 703. 703 can be a patch antenna, and its coupler 7〇2 can be a dual-ended open microstrip antenna including wafer 701, as shown in FIG. Figure 3, Figure 3a, and Figure 6a/b, L, means that the length of the coupler can be adjusted to match the impedance of the imaginary part of the wafer on the coupler. The skilled artisan can make changes without departing from the scope of the invention. The invention also relates to a design method 201119125 applied to an RFID tag, comprising the following three steps: 1. Providing a twist line body and a double-ended open coupler to form an antenna; wherein the antenna has a central operating frequency It is determined by the length of the antenna body. 2. The real impedance of the antenna is adjusted to the real impedance of a wafer by adjusting the distance between the antenna body and the coupler. 3. The imaginary impedance of the antenna is matched to the imaginary impedance of the wafer by adjusting the length of the open-ended double-ended coupler. The above description is only exemplary of the invention, and is not intended to limit the scope of the invention. That is to say, the equivalent changes and modifications made by the applicants in accordance with the scope of the patent application of the present invention should still fall within the scope of the patent of the present invention. Please ask the reviewer for the examination, and pray for the right, it is until 201119125 [Simple description of the diagram] The figure is a schematic diagram of the prior art RFID tag; Figure 1 is a schematic diagram of the working bandwidth of the prior art RFID tag antenna; Figure 2 is a schematic diagram of impedance matching between the prior art RFID tag antenna and the chip; FIG. 3 is a schematic diagram of another preferred embodiment of the radio frequency identification tag of the present invention. FIG. 4 is a phantom impedance diagram of the present invention, and FIG. 5 is the present invention. Figure 6 is a signal diagram of the return loss of the present invention, and Figure 6a is a schematic diagram of another preferred embodiment of the RFID tag of the present invention. Figure 6b A schematic diagram of another preferred embodiment of the radio frequency identification tag used in the present invention; and FIG. 7 is an example of the present invention implemented in the form of a patch antenna. [Main component symbol description] 10 RFID tag 101 Antenna body 102 Coupling loop 103 Substrate 201119125 301 Antenna body 302 Double-ended open-circuit coupler 303 Substrate 304 Radio frequency identification chip 602 _ Combiner 603 Antenna body 604 605/606 Double Antenna body 701 wafer 702 coupler 703 antenna body 704 ground substrate 10

Claims (1)

201119125 七、申請專利範圍： 1.種具有雙端開路耗合結構之RFID標數天線，其至少包 含： 一天線本體（anntena body);以及 一 _合器。 2·如申請專利範圍第1項所述之RFID標籤天線，其中該天 線本體為一偶極天線。 3. 如申請專利範圍第1項所述之RFID標籤天線，其中該麵 合器（coupler)是一個雙端開路的耦合結構。 4. 如申請專利範圍第1或3項所述之卯11}標籤天線，進一 步包括一輸入埠（input port)置於該耦合器上。 5·如申請專利範圍第1或3項所述之RFID標籤天線，其中 該耦合器本身也可以做為一個具有輻射效果的偶極天' 線。 6_如申請專利範圍第4.項所述之RFID標籤天線，進一步 包括一晶片，其_該晶片係置放於耦合器之輸入埠上。 7. 如申請專利範圍第1或3項所述之RFID標籤天線，該耦 合器之開路兩端所内含的長度可大於1/2波長， ' 波長或小於1/2波長。 8. 如申請專利範圍第1、2、3或6項所述之RFID標籤天線， 調整該耦合器之開路兩端所内含的長度，可以使輸入埠 的輸入阻抗達到所需的電抗（reactance)值。 9. 如申請專利範圍第1、2、3或6項所述之RFID標藏天線， 碉整該耦合器與該天線本體之間的距離，可以使輪入埠 的輸入阻抗達到所需的電阻（resistance)值。 1〇·如申請專利範圍第1、2、3或6項所述之RFID標鐵天 201119125 線，其中該RFID標籤天線可以採用微帶天線 (micro-strip antenna)或貝占片天'線（patch antenna)白勺 型式實施之。 11. 如申請專利範圍第10項所述之RFID標籤天線，則RFID . 標籤天線通常可以是一個貼片天線，而該耦合器通常可 以是一個雙端開路之微帶天線（micro-strip antenna)。 12. —種組成RFID標籤天線的方法，其至少包含以下步驟： (a) 提供一天線本體及一雙端開路的耦合器以構成一 天線；其中該天線的中心工作頻率通常可由該天線 本體的長度所決定， (b) 該天線的實部阻抗通常可藉由調整天線本體與耦 合器之間的距離，使其與一晶片之實部阻抗達成匹 配；以及 (c) 該天線的虛部阻抗通常可藉由調整耦合器雙端開 路的長度，使其與該晶片之虛部阻抗達成匹配。 12201119125 VII. Patent application scope: 1. An RFID digital antenna with a double-ended open-circuit consumable structure, which at least includes: an antenna body (annanta body); and a _ _ _ _ _ _ 2. The RFID tag antenna of claim 1, wherein the antenna body is a dipole antenna. 3. The RFID tag antenna of claim 1, wherein the coupler is a double-ended open coupling structure. 4. The 卯11} tag antenna as described in claim 1 or 3 further includes an input port placed on the coupler. 5. The RFID tag antenna of claim 1 or 3, wherein the coupler itself can also be used as a dipole antenna with radiation effect. 6_ The RFID tag antenna of claim 4, further comprising a wafer, the chip being placed on an input port of the coupler. 7. The RFID tag antenna of claim 1 or 3, wherein the open ends of the coupler may have a length greater than 1/2 wavelength, 'wavelength or less than 1/2 wavelength. 8. If the RFID tag antenna described in claim 1, 2, 3 or 6 is applied, adjusting the length of the open ends of the coupler allows the input impedance of the input port to reach the required reactance (reactance) )value. 9. If the RFID tag antenna described in claim 1, 2, 3 or 6 is applied, the distance between the coupler and the antenna body can be adjusted to achieve the required resistance of the input impedance of the wheel. (resistance) value. 1〇·If you apply for the RFID target iron days 201119125 line as described in the scope of claims 1, 2, 3 or 6, the RFID tag antenna can be a micro-strip antenna or a beiguille-day line ( Patch antenna) is implemented in a white form. 11. The RFID tag antenna as described in claim 10, the RFID tag antenna can usually be a patch antenna, and the coupler can usually be a double-ended open micro-strip antenna. . 12. A method of composing an RFID tag antenna, comprising at least the following steps: (a) providing an antenna body and a double-ended open coupler to form an antenna; wherein a center operating frequency of the antenna is generally available from the antenna body Determined by the length, (b) the real impedance of the antenna can usually be matched to the real impedance of a wafer by adjusting the distance between the antenna body and the coupler; and (c) the imaginary impedance of the antenna The length of the open end of the coupler can usually be adjusted to match the imaginary impedance of the wafer. 12
TW098138796A 2009-11-16 2009-11-16 RFID tag antenna having double-open ends coupler structure TW201119125A (en)

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